Using these chairs is super easy. Just place them where you need them in the classroom or kids' bedroom. Since they're stackable, you can stack up to 10 chairs together when you're not using them to save space. As for safety, these chairs are great for preschool - aged kids because there are no metal parts. But still, make sure kids use them properly and don't stand on them. When it comes to maintenance, you can simply wipe them down with a damp cloth. Avoid using harsh chemicals as they might damage the polypropylene shell. And always keep in mind the 154 lb static load capacity, so don't let heavy objects sit on them.